for part of a BANK database. Consider the ER diagram shown in . Each bank can have multiple branches, and each branch can have multiple accounts and loans. a. List the strong (nonweak) entity types in the ER diagram. b. Is there a weak entity type? If so, give its name, partial key, and identify- ing relationship. c. What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? d. List the names of all relationship types, and specify the (min, max) constraint on each participation of an entity type in a relationship type. Justify vour choices.

for part of a BANK database. Consider the ER diagram shown in . Each bank can have multiple branches, and each branch can have multiple accounts and loans. a. List the strong (nonweak) entity types in the ER diagram. b. Is there a weak entity type? If so, give its name, partial key, and identify- ing relationship. c. What constraints do the partial key and the identifying relationship of the weak entity type specify in this diagram? d. List the names of all relationship types, and specify the (min, max) constraint on each participation of an entity type in a relationship type. Justify vour choices.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Concept explainers

Enhanced ER Model

The enhanced ER model is an abbreviation for Enhanced Entity-Relationship (EER) model. As you know, the entity-relationship (ER) model is a pictorial illustration of the relationship between various entities of a domain. In the case of a large amount of data with multiple interrelated entities, the ER diagrams become complex and tough to interpret. For such cases, the need for enhancement in the ER model was observed, and thus, the EER model was designed.

Question

Consider the ER diagram shown in .
Each bank can have multiple branches, and each branch can have multiple
accounts and loans.
for part of a BANK database.
a. List the strong (nonweak) entity types in the ER diagram.
b. Is there a weak entity type? If so, give its name, partial key, and identify-
ing relationship.
c. What constraints do the partial key and the identifying relationship of the
weak entity type specify in this diagram?
d. List the names of all relationship types, and specify the (min, max)
constraint on each participation of an entity type in a relationship type.
Justify your choices.
BRANCHES
BANK_BRANCH
BANK
Code
Name
Branch_no
Addr
Addr
ACCTS
LOANS
IN
Acct_no
Balance
Loan_no
Amount
ACCOUNT
Туре
Туре
LOAN
M
M
A_C
LC
N
Ssn
Name
Phone
CUSTOMER
Addr

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